Asphalt composition and process



United States Patent 3,264,127 ASPHALT COMPOSITION AND PROCESS John P.Conley, 50 Rosemont St., Dorchester, Mass. No Drawing. FiledMay 24,1963, Ser. No. 282,889 2 Claims. (Cl. 106-160) This invention comprisesa new and improved asphalt composition for sizing paper stock andincludes within its scope a novel process of producing the sizing.

Heretofore in preparing sizing for paper stock, surfacing for highwayconstruction and other uses the employment of relatively hard asphalt asa raw material has been required, that is to say, asphalt having a ringand ball test of above 17-0. All attempts to use softer asphalt havebeen unsuccessful because it has been impossible to grind usefulmixtures of soft asphalt or to produce a composit-ion thereof which willnot block or solidify in storage and transportation.

The present invention is based upon my discovery of the unexpected andunforseeable properties of a specific anthracite when ground and mixedwith a soft asphalt. The specific anthracite is found so far as I knowin only one vein in .the State of Pennsylvania. It has the followingformula, viz.:

Percent Moisture .45 Combined volatile matter 9.00 Fixed carbon 79.6 Ash1 1.4 Sulphur .73 Iron .46 Manganese .002 Solubility in acid .40I-nfinity--Condnctivity:

Specific gravity (real) 1.460

For convenience I shall refer to this specific anthracite in its groundor powdered form as Congolite.

When this specific anthracite or Congolite in ground form is mixed inthe proper proportions with a soft asphalt it has the remarkable andunpredictable property of adapting the soft asphalt for grinding byrendering it friable so that the mixture may be ground without blockingin the mass or of clogging the grinding mill.

The addition of this Congolite anthracite moreover has the furtherunexpected effect of producing a mixture which is stronger, tougher andmore friable than the original straight asphalt used in the mixture. Theball and ring viscosity test is found to have increased by 45-60".

One important use of asphalt is in sizing for paper stock. The presentinvention renders it possible to produce a satisfactory sizing from lowmelt asphalt that will fiux at the usual spreading and dryingtemperatures employed in the paper-making industry. \Heretofore sizingsof high melt asphalts have been unsatisfactory because their fluxingtemperature has been substantially above that in commercial use forspreading and sizing.

Another important use for asphalt is in the surfacing of highways.Heretofore low melt asphalt has been considered unsatisfactory for thatpurpose because of its relatively low softening point. By mixing myCongolite anthracite with low melt asphalt an asphalt mixture is formedthat is sufficiently hard to serve as an excellent highway surfacing andat a substantially lower cost than surfacing having a component of highmelt asphalt.

Starting with a low melt asphalt of 160 ring test viscosity and addingmy specific Congolite anthracite in increasing amounts the result-s aresubstantially as follows:

Percentage Congolite: Ring test 10 164. 20 16-6 30 168 40 176 50 208. 60350. Not meltable. Fineness through 200 mesh. or

To 98.5%, through 325 mesh.

At such degrees of fineness Congolite is almost incomlbusti ble.

The Congolite and low melt asphalt are ground together and when appliedas a sizing agent the asphalt fluxes at normal conditions with thesizing much improved over that of a high melt asphalt size under thesame conditions.

When Congolite and asphalt are fluxed together (50 50) and cooled, themixture is much stronger and friable and tougher than that of thestraight asphalt. -At 70% Congolite the softening point of the mixturebecomes too high for purposes of this invention.

With this in mind, a dry asphalt size for paper stock using Congolite,170 melting point asphalt, ground linseed meal, and rosin size is asfollows:

Percent Congolite 45 A 170 M.P. asphalt 46% Linseed meal 7 /2 Dry rosinsize 1 These were mortared and pestled until a fine grind was apparent.Sizing results were better than that of any high melt asphalt groundsize.

Another satisfactory sizing formula for paper stock comprises:

Percent Congolite 20 Portland cement 9 Linseed meal 20 170 MJP. asphalt50 Rosin 1 Percent Moisture .45 Volatile matter 9.00 Fixed carbon 79.6Ash 11.4

Patented August 2, 1966' and then grinding the mixture thus preparedthereby producing a sizing that will flow at the usual spreading anddrying temperat nres employed in the paper making industry.

2. The process of making a sizing for paper stock, which consists inmixing and grinding 90-31% of asphalt of approximately 160-170 ring andball test as specified in claim 1, with about 20% powdered asphalt ofthe following formula:

4 References Cited by the Examiner UNITED STATES PATENTS 180,081 7/1876Warren 117-158 XR 1,961,678 6/ 1934 Sweeney 106-276 2,127,298 8/ 1938Issacs 106-160 2,413,610 12/ 1946 Donelson.

2,45 8, 143 1/ 1949 Burns et al 11730 OTHER REFERENCES Abrahams,Asphalts and Allied Substance, vol. 3, Van Nostrand Co. Inc., N.Y.,1960, pages 23 1 to 365.

ALEXANDER H. BRODMERKEL, Primary Examiner.

together with 1 0% Portland cement, 20% linseed meal 15 MORRIS LIEBMANExaminer and approximately 1% of rosin.

J. B. EVANS, Assistant Examiner.

1. THE PROCESS FOR MAKING A SIZING FOR PAPER STOCK WHICH CONSISTS OFMIXING 90-31% OF ASPPHALT OF APPROXIMATELY 160-170 RING AND BALL TESTWITH ABOUT 10-69% LINSEED METAL AND PROWERED ANTHRACITE OF THE FOLLOWINGFORMULA PERCENT MOISTURE .45 VOLATILE MATTER 9.00 FIXED CARBON 79.6 ASH11.4 AND THEN GRIDING THE MIXTURE THUS PREPARED THEREBY